There was support, anger, frustration and concern when word spread that Jason Pierre-Paul had lost his right index finger, the result of a July 4 fireworks accident which potentially could ruin his future.

Former teammates Antrel Rolle and Osi Umenyiora were happy to hear the defensive end is relatively healthy — aside from the lost finger and severe burns to his right arm — expressing their positive thoughts on social media. Another former teammate, two-time Giants Super Bowl champion David Diehl, however, raised the possibility the hospital-ridden defensive end conceivably could have suffered a “career-ending” injury that shined a light on his immaturity.

“Let’s face it here, the biggest thing of all this, it’s your hand,” Diehl said Wednesday on SiriusXM Radio. “As an offensive lineman, as a defensive lineman, that is your most valuable asset that you can have on the football field. The way that you can punch, the way that you can grab, the way that you can pull, the way that you have to do all those things to get inside hand leverage and control another football player. It’s all about your hand placement and what you’re able to do.

“If he has all these burns, if he’s getting a skin graft, if he has nerve damage, that is possibly a career-ending injury, because if you come back, and it’s never the same. … If you can’t do all of those things with your hands, you’re not going to be successful in the NFL.”

Diehl questioned why the Giants, who tried unsuccessfully to visit Pierre-Paul and have a $14.8 million franchise tender waiting for him to sign, would want to make a long-term commitment to a player with questionable judgment.

“This is his sixth year,” Diehl said. “This isn’t his rookie year. If they feel, and you need somebody to watch you going into your sixth year because of immaturity, yeah, that’s throwing up red flags for everybody all around. Why would you invest that long-term deal into somebody that you’re not 100 percent confident that day-in and day-out they’re going to punch the clock … and when they leave at the end of the day, they’re not the first guys leaving.”

Meanwhile, current teammate Rashad Jennings, said he supported Pierre-Paul — though that was before news of the amputated finger was released.

“The first thing is I felt for him, but accidents happen and nobody’s immune,” Jennings said. “You don’t harp on it. It’s just unfortunate. It can happen to anybody at any time. He’s playing with his son, shoots a firework, and then he can’t go to work. It happens. Nobody’s mad at all.”